25MAMA-NUV-MAMA, Clear

Description

The 25MAMA mode with the NUV-MAMA provides high-throughput broad-band near-UV imaging with excellent spatial resolution and very high throughput at ~2500 Å. The field of view is 25 x 25 arcsec.

Recommended Uses

Recommended for broad-band near-UV imaging.

Special Considerations

NUV-MAMA clear images will be slightly out of focus because the mirror optimally focuses for use of a filter. Whenever possible, use F25SRF2 or F25QTZ instead of 25MAMA for NUV-MAMA imaging

For long exposures of faint targets, sky background is likely to be a limiting factor. Observers should consider the use of DARKTIME or (preferably) use the F25QTZ filter, which has nearly the same throughput but rejects geocoronal Lyman- and OI 1302 Å air glow.

Pivot (Å)	FWHM (Å)	AB mag zeropoint	Speak	B	R80 (arcsec)	Flux in central pixel
2249.8	1201.9	24.085	1.76e+14	11605	0.32	8%

Figure 14.23: 25MAMA NUV-MAM Integrated System Throughput and Redleak

Figure 14.24: Point Source S/N vs. V+AB for the 25MAMA NUV-MAMA mode. Top curves are for DARKTIME. Bottom curves are for average sky. Top curves are for DARKTIME. Bottom curves are for average sky.

Figure 14.25: Extended Source S/N vs. V+AB for the 25MAMA NUV-MAMA mode. Top curves are for an area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed.

Figure 14.26: Point Source Encircled Energy for 25MAMA NUV-MAMA

Figure 14.27: Point Source Intensity vs. Radius for 25MAMA NUV-MAMA